AutoCodes – GMC – U0028 2016 GMC Sierra

U0028 2016 GMC Sierra Code - Media Oriented Systems Transport Bus

Quick Answer

The Media Oriented Systems Transport (MOST) bus consists of a physical ring in which multimedia devices share audio, video and infotainment system control data. Common causes include Faulty Audio Unit (Radio), Audio Unit harness is open or shorted, Audio Unit circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: U0028 2016 GMC Sierra indicates Media Oriented Systems Transport Bus.
Common causes: Common causes include Faulty Audio Unit (Radio), Audio Unit harness is open or shorted, Audio Unit circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 273

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 19, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0028 2016 GMC Sierra Description

The Media Oriented Systems Transport (MOST) bus consists of a physical ring in which multimedia devices share audio, video and infotainment system control data. Each device on the MOST bus transmits and receives data via the MOST Bus Serial Data (+/- transmit/receive) circuits. The MOST bus diagnostic master is the Radio. The MOST control circuit is connected to each device on the MOST bus. Each device provides a 12 V signal on the MOST control circuit. The Radio initiates communication on the MOST bus at Ignition ON by toggling the MOST control circuit low for 100 ms. Once each device recognizes the wakeup signal from the Radio on the MOST control circuit, they will respond to the Radio on the MOST bus to indicate no faults are present and normal communications will commence. The Diagnostic Trouble Code (DTC) sets when a fault occurs on transmit, receive, electronic control lines, or internal device failure.

OBDII Code U0028 2016 GMC Sierra - Media Oriented Systems Transport Bus - AutoCodes.com — U0028 2016 GMC Sierra Code - Media Oriented Systems Transport Bus

What does this mean?

What are the Possible Causes of the DTC U0028 2016 GMC Sierra?

Faulty Audio Unit (Radio)
Audio Unit harness is open or shorted
Audio Unit circuit poor electrical connection

How to Fix the DTC U0028 2016 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U0028 2016 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U0028 2016 GMC Sierra Code

1. What does the OBDII code U0028 on a 2016 GMC Sierra mean?

The code U0028 for a 2016 GMC Sierra refers to a problem with the Media Oriented Systems Transport (MOST) Bus communication network in the vehicle.

2. What are common symptoms of the U0028 code on a 2016 GMC Sierra?

Common symptoms of the U0028 code may include issues with the infotainment system, malfunctioning audio components, loss of communication with certain modules, or intermittent electrical problems.

3. What are possible causes of the U0028 OBDII code on a 2016 GMC Sierra?

Potential causes of the U0028 code can include damaged wiring or connectors in the MOST Bus network, faulty control modules, software glitches, or issues with the media system components.

4. How can I diagnose the U0028 code on my 2016 GMC Sierra?

Diagnosing the U0028 code typically involves using a professional OBDII scanner to retrieve the specific fault codes, checking the MOST Bus network for continuity, inspecting wiring and connectors for damage, and testing individual components for proper functionality.

5. Can I repair the U0028 code on my 2016 GMC Sierra myself?

Repairing the U0028 code may require advanced diagnostic skills and specialized tools. While simple fixes like checking and reseating connectors can be done by DIY enthusiasts, more complex issues with the MOST Bus network or control modules may require professional assistance.

6. Are there any common quick fixes for the U0028 code on a 2016 GMC Sierra?

Quick fixes for the U0028 code may include resetting the vehicle's infotainment system, checking for loose connections in the MOST Bus network, or performing a software update if available from the manufacturer.

7. Is it safe to continue driving with the U0028 OBDII code on a 2016 GMC Sierra?

It is generally not recommended to drive the vehicle with unresolved U0028 code issues, as they can potentially lead to more severe electrical problems or complete failure of the media system components.

8. How much does it typically cost to repair the U0028 code on a 2016 GMC Sierra?

The cost of repairing the U0028 code can vary depending on the specific cause of the issue. Simple fixes like reconnecting loose wires may be inexpensive, while replacing faulty control modules or repairing the MOST Bus network can be more costly.

9. Can the U0028 code on a 2016 GMC Sierra cause other problems in the vehicle?

Yes, unresolved issues related to the U0028 code can potentially cause other electrical malfunctions in the vehicle, affect the performance of media system components, or lead to communication errors with other modules.

10. How can I prevent the U0028 OBDII code from reoccurring on my 2016 GMC Sierra?

Regular maintenance, checking for loose connections, avoiding water damage to electrical components, and addressing any issues with the media system promptly can help prevent the U0028 code from reoccurring in your 2016 GMC Sierra.